Since you're posting this in the Photoshop Forum, I'm assuming you are wanting to know a method for changing the photo background using Photoshop.
You'll need to be much more specific about what you want to do if you want anyone to help you. Post a copy of the photo you're working on. Tell us how you want to "change" the background (Change/remove colour? Blur? Remove background altogether? Replace with a different background?)
Help us to help you.
__________________ "I might join your century, but only as a doubtful guest"
background program
Linear Mode
